Website Revamp - UI/UX and Security Features Upgrade

HI, I need help with below task for existing web site
UI/UX Design Update

Redesign parts of the user interface for a modern and clean look.

Ensure user-friendly navigation and mobile responsiveness.

Apply consistent design standards across all pages/screens.

Data Encryption

Implement end-to-end encryption for sensitive data (in transit & at rest).

Follow industry standards (AES-256, TLS 1.2+).

Ensure proper key management and secure storage.

Authentication & Authorization

Add Two-Step Authentication (2FA) (via SMS, Email, or authenticator app).

Review and improve existing login/authorization flow.

Role-based access control (RBAC) for different user levels.

User-Friendliness Enhancements

Simplify workflows (fewer clicks, clear call-to-actions).

Improve error messages and validation feedback.

Add tooltips/help prompts where necessary.

Performance & Scalability

Optimize backend queries and API calls.

Improve page load time and responsiveness.

Ensure application can scale to higher user loads.

Conduct stress testing and provide recommendations.